Some physical quantities have only numerical values and no direction. The operation between these quantities follows the general algebraic law. Such quantities are called scalars. Such as mass, density, temperature, work, energy, distance, speed, volume, time, heat, resistance and other physical quantities. No matter what coordinate system you choose, the scalar value remains the same. The product of a vector and a scalar is still a vector.
Extended data:
Precautions for calculation:
1. Shapes need to be on the same layer: when adding and subtracting figures, it must be noted that the two shapes must be on the same layer. You can create two new layers and hold down Ctrl+E to merge them.
2. The relative position of layers is very important: if you want to subtract the shape of the top from the original image, remember to choose the lowest image. If you are not sure it is the bottom image, you can put the shape at the bottom in the path arrangement. If all shapes are selected or the top shape is selected to execute this command, ps will be subtracted by default, and the original opaque part will become a shape.
3. Hold down Shift+Alt, which means that the overlapping part of the original shape and the newly created shape will be preserved. Be sure to hold down the key combination first, otherwise a new layer will be created, and then a square (such as a rectangle) will be created with the origin as the center.
Baidu Encyclopedia-Vector Products
Baidu Encyclopedia-Standard Product